Gunner, you mean, steel!......grin! The small pocks are from a .260, the clean through holes are the work of 300 grain Bergers at 2850fps.
How thick is the metal? What distance and what weight/fps of 260 bullet. I believe that the 264wm with 73gr h4831 pushing 85gr hp 3800 to 4000fps would go through as I came close to pushing one through 1" thick boiler plate on a chain at 100yrds. (speed Kills)